sparc64/pci_sun4v: fix ATU checks for large DMA masks
Now that we allow drivers to always need to set larger than required
DMA masks we need to be a little more careful in the sun4v PCI iommu
driver to chose when to select the ATU support - a larger DMA mask
can be set even when the platform does not support ATU, so we always
have to check if it is avaiable before using it. Add a little helper
for that and use it in all the places where we make ATU usage decisions
based on the DMA mask.
Fixes: 24132a419c68 ("sparc64/pci_sun4v: allow large DMA masks")
Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Meelis Roos <mroos@linux.ee>
Acked-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index a8af602..14b93c5 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -73,6 +73,11 @@
p->npages = 0;
}
+static inline bool iommu_use_atu(struct iommu *iommu, u64 mask)
+{
+ return iommu->atu && mask > DMA_BIT_MASK(32);
+}
+
/* Interrupts must be disabled. */
static long iommu_batch_flush(struct iommu_batch *p, u64 mask)
{
@@ -92,7 +97,7 @@
prot &= (HV_PCI_MAP_ATTR_READ | HV_PCI_MAP_ATTR_WRITE);
while (npages != 0) {
- if (mask <= DMA_BIT_MASK(32) || !pbm->iommu->atu) {
+ if (!iommu_use_atu(pbm->iommu, mask)) {
num = pci_sun4v_iommu_map(devhandle,
HV_PCI_TSBID(0, entry),
npages,
@@ -179,7 +184,6 @@
unsigned long flags, order, first_page, npages, n;
unsigned long prot = 0;
struct iommu *iommu;
- struct atu *atu;
struct iommu_map_table *tbl;
struct page *page;
void *ret;
@@ -205,13 +209,11 @@
memset((char *)first_page, 0, PAGE_SIZE << order);
iommu = dev->archdata.iommu;
- atu = iommu->atu;
-
mask = dev->coherent_dma_mask;
- if (mask <= DMA_BIT_MASK(32) || !atu)
+ if (!iommu_use_atu(iommu, mask))
tbl = &iommu->tbl;
else
- tbl = &atu->tbl;
+ tbl = &iommu->atu->tbl;
entry = iommu_tbl_range_alloc(dev, tbl, npages, NULL,
(unsigned long)(-1), 0);
@@ -333,7 +335,7 @@
atu = iommu->atu;
devhandle = pbm->devhandle;
- if (dvma <= DMA_BIT_MASK(32)) {
+ if (!iommu_use_atu(iommu, dvma)) {
tbl = &iommu->tbl;
iotsb_num = 0; /* we don't care for legacy iommu */
} else {
@@ -374,7 +376,7 @@
npages >>= IO_PAGE_SHIFT;
mask = *dev->dma_mask;
- if (mask <= DMA_BIT_MASK(32))
+ if (!iommu_use_atu(iommu, mask))
tbl = &iommu->tbl;
else
tbl = &atu->tbl;
@@ -510,7 +512,7 @@
IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
mask = *dev->dma_mask;
- if (mask <= DMA_BIT_MASK(32))
+ if (!iommu_use_atu(iommu, mask))
tbl = &iommu->tbl;
else
tbl = &atu->tbl;
